LaCie make a 1TB portable drive. I don't know if it can draw power from USB, but they work well on Firewire. Note, it's 2x2.5" drives, so yeah pretty pricey. I have a 500Gb model and it was ~$500
RRP for the 1TB is $799 according to LaCie.
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MBP 2.4GHz | 4GB | 160GB + 500GB Little Big Disk Quadra | 17" + 20" ACD | BT600
Mac Mini 2GHz | 4GB | 120GB + 1000GB d2 Quadra + 500GB d2 Quadra + 4000GB Biggest Quadra (TM)
Linksys AM300 | Airport Extreme Dual Band | AppleTV 40GB
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